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NITED STATES i FICEQ ALFRED KERN, OEBASLE, SWVITZERLAND, ASSIGNOR TO THEBADISGHE ANILIN ANDSODA FABRIK, OF MANNHEIM, GERMANY.

ETHYL-BLUE COLORING=MATTER.

SPECIFICATION forming part of Letters Patent No. 297,416, dated April22, 1884.

Application filed March 4, 1884. (Specimens) To all whom it may concern:Be it known that I, ALFRED KERN, a citizen of the Swiss Republic,residing at Basle, Switzerland, have invented new and usefulImprovements in the Manufacture of a Purple Dye-Stuff orColoring-Matter, of which the following is a specification.

This invention relates to the production of benzyl-violet B B, a purpledye-stufi' or coloring-matter produced by the condensation oftetraethyldiamidobenzophenone with dibenzyl-aniliue.

In carrying out this invention I take about ten parts, by weight, of dryand finely-powdered tetra-ethyl-diamido-benzophenone and mix the sameintimately with about ten parts, by weights, of dibenzyl-aniline, and Ithen add about nine parts, by' weight, of oxychloride of phosphorus. Themixture thus obtained is kept constantly stirred until the reaction,which quickly sets in,and which manifests itself by a considerable riseof temperature, gradually begins to subside. I then heat the semi-fluiddark-colored product thus obtained up to a temperature of about 120centigrade, and I maintain the said temperature during about half anhour, or until a homogeneous bronze-colored melt is obtained,whichsolidifies upon cooling. In order to separate my new purplecoloringmatter thus produced, the said melt is powdered and then washedwith cold water until the washings begin to assume a purple color. Thewashed residue is then exhausted with boiling water,with the addition ofabout one part, by volume, of strong hydrochloric acid of about 1.18specific gravity, and the solution thus obtained is filtered andprecipitated with common salt. The precipitated coloring-matter may befurther purified by renewed solution in boiling -water and precipitationwith common salt. After ored powder.

tube, it fuses into a blue transparent mass,and upon the applicationofstronger heat it becomes decomposed under evolution of pungent vaporspossessing the characteristic smell of oil of bitter almonds and otherbenzyle compounds. Benzyl-violet B B is sparingly soluble in cold water.It dissolves easily in boiling water, alcohol, and glacial acetic acid.It forms, likewise, asolution with benzole, and is precipitated from thesame by the addition of petroleum-spirit or ligroine. The color of itssolutions is a bluish purple, which becomes changed, by the gradualaddition of strong hydrochloric acid, first into blue, then into green,and at last into orangeyellow. These changes, however, do not takeplacewith the same readiness as in the case of the ordinary benzylatedmethyl-violets, being submitted to the same treatment with hydrochloricacid, in consequence of which the dyes produced by benzylviolet B 13upon animal or vegetable fiber are less affected by acids than thecorresponding shades dyed with the ordinary benzyla-ted methyl-violetshitherto in use. Benzyl-violet B B dyes abright bluish purple upon thesaid fibers. The dyes thus produced are of a bluer shade than thoseobtained by benzylviolet 13-11. coloring-matter or dye-stufl' whichforms the subject-matter of a separate application for Letters Patentfiled by me on the 10th day of January, 1884, Serial N 0. 117,059.

\Vhat I claim as new, and desire to secure by Letters Patent, is

The blue coloring-matter produced by the condensationoftetra-ethyl-diamido-benzophenone with dibenzylaniline, and having thecharacteristics above described.

In testimony whereof I have hereunto set my hand and seal in thepresence of two subscribing witnesses.

ALFRED KERN. [1,. s]

lVitnesses:

N. HENZI, CHS. A. RICHTER.

